$ git clone -n https://src.fedoraproject.org/rpms/test-drive.git /var/lib/mock/f45-build-36945-709/root/chroot_tmpdir/scmroot/test-drive
Cloning into '/var/lib/mock/f45-build-36945-709/root/chroot_tmpdir/scmroot/test-drive'...
$ git fetch origin 98c10621cd4aefcb78d948f11b2dba208cc305fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/test-drive
 * [new ref]         98c10621cd4aefcb78d948f11b2dba208cc305fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98c1062 Update to version 0.6.1 (rhbz#2494937)